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Interlocks & Guard Switches

Interlocks and Guard Switches (Industrial Machine Safety Interlocking)

Interlocks and guard switches are critical components in industrial machine safety systems. These devices monitor the position of safety gates, guard doors, and protective barriers to ensure machinery operates only when safe conditions are met. When a guard is opened or removed, the interlock switch signals the safety circuit to stop machine motion and prevent hazardous operation.

Industrial interlocks are widely used in automated production lines, packaging equipment, robotic cells, conveyors, and assembly systems. Using the correct interlock series ensures compatibility with existing machine guarding hardware and helps maintain reliable safety performance in demanding industrial environments.

This category includes refurbished interlock switches and guard monitoring devices used for maintenance replacement and spare inventory. Maintaining compatible replacement hardware allows facilities to repair machines quickly and minimize production downtime.

Typical interlock applications

  • Safety gate monitoring for robotic cells
  • Guard door monitoring on packaging equipment
  • Access control for automated production lines
  • Protective enclosure monitoring for hazardous machinery
  • OEM machine safety integration

Shop by interlock series

Related categories

When replacing an interlock device, verify mounting orientation, actuator compatibility, electrical connections, and application requirements before installation to ensure the safety system functions correctly.

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    Allen-Bradley

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    About Allen-Bradley 440LF4B1200NProduct Overview Allen-Bradley 440LF4B1200N is a refurbished 440L safety interlock designed for industrial machine guarding and access control. It is commonly used to help prevent access to hazardous motion by monitoring...

    $20.00
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    Allen-Bradley

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    About Allen-Bradley 440LF4B1050NProduct Overview Allen-Bradley 440LF4B1050N is a refurbished 440L safety interlock designed for industrial machine guarding and access control. It is commonly used to help prevent access to hazardous motion by monitoring...

    $20.00
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    Allen-Bradley

    Allen-Bradley 440LF4B0900N 440L Interlock (New Surplus)

    About Allen-Bradley 440LF4B0900NProduct Overview Allen-Bradley 440LF4B0900N is a refurbished 440L safety interlock designed for industrial machine guarding and access control. It is commonly used to help prevent access to hazardous motion by monitoring...

    $20.00
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    Allen-Bradley

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    About Allen-Bradley 440LE4D0900NProduct Overview Allen-Bradley 440LE4D0900N is a refurbished 440L safety interlock designed for industrial machine guarding and access control. It is commonly used to help prevent access to hazardous motion by monitoring...

    $20.00
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    Allen-Bradley

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    About Allen-Bradley 440LE4D0750NProduct Overview Allen-Bradley 440LE4D0750N is a refurbished 440L safety interlock designed for industrial machine guarding and access control. It is commonly used to help prevent access to hazardous motion by monitoring...

    $20.00
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    Allen-Bradley

    Allen-Bradley 440LE4D0600N 440L Interlock (New Surplus)

    About Allen-Bradley 440LE4D0600NProduct Overview Allen-Bradley 440LE4D0600N is a refurbished 440L safety interlock designed for industrial machine guarding and access control. It is commonly used to help prevent access to hazardous motion by monitoring...

    $20.00
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    Allen-Bradley

    Allen-Bradley 440LE4D0450N 440L Interlock (New Surplus)

    About Allen-Bradley 440LE4D0450NProduct Overview Allen-Bradley 440LE4D0450N is a refurbished 440L safety interlock designed for industrial machine guarding and access control. It is commonly used to help prevent access to hazardous motion by monitoring...

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    Allen-Bradley

    Allen-Bradley 440LE4D0300N 440L Interlock (New Surplus)

    About Allen-Bradley 440LE4D0300NProduct Overview Allen-Bradley 440LE4D0300N is a refurbished 440L safety interlock designed for industrial machine guarding and access control. It is commonly used to help prevent access to hazardous motion by monitoring...

    $20.00
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    Allen-Bradley

    Allen-Bradley 440LE4B0900N 440L Interlock (New Surplus)

    About Allen-Bradley 440LE4B0900NProduct Overview Allen-Bradley 440LE4B0900N is a refurbished 440L safety interlock designed for industrial machine guarding and access control. It is commonly used to help prevent access to hazardous motion by monitoring...

    $20.00
    Ask for Quote
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    Allen-Bradley

    Allen-Bradley 440LE4B0750N 440L Interlock (New Surplus)

    About Allen-Bradley 440LE4B0750NProduct Overview Allen-Bradley 440LE4B0750N is a refurbished 440L safety interlock designed for industrial machine guarding and access control. It is commonly used to help prevent access to hazardous motion by monitoring...

    $20.00
    Ask for Quote
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    Allen-Bradley

    Allen-Bradley 440LE4B0600N 440L Interlock (New Surplus)

    About Allen-Bradley 440LE4B0600NProduct Overview Allen-Bradley 440LE4B0600N is a refurbished 440L safety interlock designed for industrial machine guarding and access control. It is commonly used to help prevent access to hazardous motion by monitoring...

    $20.00
    Ask for Quote
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    Allen-Bradley

    Allen-Bradley 440LE4B0450N 440L Interlock (New Surplus)

    About Allen-Bradley 440LE4B0450NProduct Overview Allen-Bradley 440LE4B0450N is a refurbished 440L safety interlock designed for industrial machine guarding and access control. It is commonly used to help prevent access to hazardous motion by monitoring...

    $20.00
    Ask for Quote
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